Carbureter.



G. BROWN.

GARBURETER. APPLIUATION FILED NOV. 14. 1910.

1,065,916. Patented July 1, 1913.

COLUMBIA. PLANOORAPH C0, WASHINGTON. n, C.

ber mounted thereon.

CIZEMEN'T BROWN, .01? BIRCHFIELI), BIRMINGHAM, ENGLAND.

CARIBURE-TER.

Specification of Letters Patent.

Patented J uflyi, 1913.

,Appli-cationgfil-ed November; 1.4, 1910. ,SerialNo, 592,314.

To all 10710111 z'tmay concern:

ZBe 1t known that I, C MENT Brown, a

subjectof :the King of Great Britain, re-1' siding at jBirchfield, Birmingham, in the} county of Warwick, England, have invented certain new and useful Improvements in or? Relating to Ga-rbureters :Such as are Used; with lnternaleCombustion Engines, ot which This invention comprises ,l'DIPEOIVQHlGIIiZSI .in or relating to earbureters such as are; used with internal combustion engines and; have a jet controlled by a rotatable ,nlem

According :to the present invention lthe regulating edge of the rotatable member is adapted-to .vary the i-ituel orifice by-virtue of the curved or helical shape ofthe saidmem-j ber whereby =upon relative rotation liming set up :the regulating edge ,gradua lly .a,d, .v-ances across the ,fuel orifice, or vlce versa.=

Such curved or "helical shape readily .as-i sists 1n -;prod-uc- 1ng a var ation ,1n the ,eX posed or effective :area .-of-the ,fuel orifice at;

any given position of the 'memberoperatingj thej et, as a slight relative rotation of either the jet {or the rotatable member, as the-case may be, has the effect .of creating an fin-- crease in area, {or the :reverse according to the adjustment desired, of the fuel orifice.

Said- ;adjustment is particularly valuable when employed in oarbu-ret-er in which the throttlemember is operativcly coupled iwitlrthe variable ,jzet as by its incorporation the adaptation of the, carbureter t-oany par- .ticularengine or :to fulfil certain conditions zisirendered {fa r easieri-tha n l as hitherto been the case when .110 adjustment is :provided.

Further 1 preferably so provide for .said

adjustment that the same can be. effected by :the simple movement ofa levenand during the working.- of theengine.

In order that this invention {may be ,clearly understood and @more readily "car- ,ried into practice, refe-rencermay be had to the appended explanatory drawing, upon which Figure 1 is a vertical longitudinal section through the preferred iformiof my carbureter according to :the present invention. Fig. 2 is a sectional View on the line a:a' of Fig. .1. Fig. .3 ,isa central vertical section through a modified form of jet controlling means similar to that illustrated" in Fig. 1. Fig. 4t is an enlarged perspec tive View of a detail of the carbureter shown 1 ;in Fig. 1. Fig. 5 is a similar view to Fig.

2 showing a modified ,form for connecting the jet and controlling members. Fig. 6 is an end elevation of the carbureter shown in Fig. '5. Fig. 7 is a plan view of the .jet regulating member used in connection with the device shown in Fig. 1

-In the carbureter as illustrated in the I .drawing a housing provides a conduit :0

with pistons vor short sleevesQ and 2 near each end, said pistons being coupled to a -;common operating .member so as to move in unison and thereby concurrently regulate the main air intake 3 and mixture outlet ;ports 4,01" in other wordsregulatethe flow of fluid through conduit 0.

Each piston is connected ;to the operating ,means by screw threadsb whichenabletit to be independentlyadjusted in relation tothe ,port which it controls, ,an oscillatory arm 6 being intermediate ,andconnected to the pistons .byshort pivoted links .7, said .arm being also adapted to rotate the curved member 8 whichcontrols the effective area of the fuelorifice. Another method ofoperating the pistons and variable jet is .by ,a rack 7 Figs. .5rand 6,.connected with the pistons and engaging with the pin-ion Won the rotatable member .19 of .the ,jet. The extremities of the housing-mayconveniently be closed byscrew caps .9.

The top 100i the jet 1 1 is flat and the .rotatedcut ofiimember 8 is disk shaped, see fZ,-the edge .12 of the latter being of a .cam shape or cut away ,form so as to uncover at the full. open positionxthe fuel aperture113 in the-top of the jet. Fromiheiull- .open,positionthe edge ofthe disk assumes a cam contour until it merges into the .pe- .riphery 14-015 the disk, -so that as the cut oil edge ;-r0.tates, the latter gradually ad- ;vances and ,covers the ifuel aperture, this .movement taking place concurrently with ,the closure of thethrottle.

By disposingithecutbfii edgeon the periphery of .the rotated member I am enabledto form ;the said edge by milling or gthelike whereby-,-its manufacture isgreatly gtacilitated.

A spigot 1e, Fig. 1,;is formed onone of the members and is adapted to engage a faucet on the other member to retain the rotative member and jet in alinement, the cut ofif member 8 being extended in an upward direction and connected to the throttle member 2 by means which allow the exposed area of the fuel orifice to be adjusted independently of the throttle member. An outer sleeve or cylinder 19 is arranged concentrically with and connected to the outward extension 15 of the cut off member 8 by means of a spring 16, and key 16", an operating lever 17 having a series of key receiving recesses 17 shown in Fig. 4c for the key 16 being attached to the outer sleeve or cylinder. To adjust the cam S, the knur-l top 18 of the cam extension 15 is grasped and lifted against the resistance of the spring 16, then turned and released so that the key 16 engages with one of the recesses 17 in the top of the lever 17. Liquid fuel enters a chamber C by an aperture 28, F 3, said chamber C and conduit C having an abutment therebetween while fiber washers 26 between a flange f on jet 11 in conjunction with a screw cap 25 and spring 27 prevent egress of fuel except through the aperture 13.

29 is a pure air port which when the control member 2 is moved to the extreme left allows uncarbureted air to pass into the annulus 4 and thence to the engine.

The auxiliary air supply admitted to the carbureter so as to pass over the jet and may enter by the same port 20 as the main air, a device for regulating the auxiliary air supply consisting of a spiral spring 21 attached to a plate 22 at one end and free at the other, a plate 23 being provided at the free end of the spring 22 and perforated by a hole 2 1.

I will now proceed to describe the adaptation of the carbureter according to the invention, to an internal combustion engine.

The motor is run at its normal speed and the jet adjusted by hand from the exterior of the carburetor by means of the lever 17 or its equivalent, such adjustment being effected without dismantling any part during the time the motor is Working. The throttle member 2- after removal of the corresponding housing cap is moved along the screw 5 to the position in which the engine is supplied with. sufiicient mixture to keep it slowly revolving when declutched, the intake piston 2 being then adjusted to admit the volume of air relative to the opening of the mixture outlet so as to insure good carburization, such adjustment for running is also conveniently effected during the working of the motor. The earbureter having now been adjusted by entirely independent means for normal and slow running, it only remains to compensate for the increased vacuum obtaining when the engine is running at. a very high speed and this is effected by the automatic air valve aforedescribed. As it is only desirable to admit auxiliary air at the highest speed and to preclude the induction of the same at other speeds, the hole 24; is of an area sufficient to admit only the volume of air requisite for normal. speed, thus the normal air enters through the interior of the spring, whereas the supplementary air passes between the coils owing to the extension of the spring which takes place when the demand for air exceeds that which the hole 2a is able to supply.

I claim:

1. In a fuel controlling device, the combination of means providing a conduit with a fuel inlet opening thereto, a valve for controlling and varying said inlet, a stem for said valve having a head and a key, a shell revoluble about said stem, a lever rigidly connected to said shell, loosely embracing said stem below said head and provided with keying portions for coaction with the said key thereof, a spring for normally holding said valve in operative relation to said fuel inlet and retaining said key in operative relation to said lever, means for controlling passage of fluid through said conduit, and instrumentality operatively connecting said last mentioned means with said shell to actuate the former upon movement of the latter, substantially as and for the purpose set forth.

2. In a fuel controlling device, the combination of means providing a conduit with a fuel inlet opening thereto, a valve for controlling and varying said inlet, a stem for said valve, a member revoluble independently of said valve stem and concentric thereto, means for controlling passage of fluid through said conduit, instrumentality operatively connecting said last mentioned means with said revoluble member to actuate the former upon movement of the latter, and means adapted to key said revoluble member and valve stem together, but permitting adjustment therebetween whereby the position of said valve with respect to said fuel inlet may be changed relative to said revoluble member, substantially as and for the purpose set forth.

In Witness whereof I have hereunto set my hand in the presence of two witnesses.

CLEMENT BROi/VN.

Gop'ies of this patent may be obtained for five cents each, by addressing the Commissioner of Fatents,

Washington, D. G. 

